如何对每个数据库连接执行查询 [英] How to execute a query per db connection

问题描述

我目前正在执行以下操作，但效率不高，因为它是在每次操作之前调用它

I'm currently doing the following which works but is inefficient since it's calling it before every action

class ApplicationController < ActionController::Base
  before_action :set_intervalstyle
  
  private
  def set_intervalstyle
    ActiveRecord::Base.connection.exec_query("SET intervalstyle = iso_8601", "SCHEMA")
  end
end

我注意到此处他们正在为每个连接注册此命令

I noticed here that they're registering this command per connection

  alias_method :configure_connection_without_interval, :configure_connection
  define_method :configure_connection do
    configure_connection_without_interval
    execute('SET intervalstyle = iso_8601', 'SCHEMA')
  end

有人可以帮我弄清楚如何将我的before_action转换成这样的东西吗?也许作为初始化器?我不确定从哪里开始

Could someone help me figure out how to convert my before_action into something like this? Maybe as an initializer? I'm not sure where to start

推荐答案

不确定这是否是个好主意，但到目前为止，它仍然有效并且没有任何副作用

Not sure if this is a good idea but so far this works and hasn't had any side effects

config/initializers/set_intervalstyle.rb

config/initializers/set_intervalstyle.rb

require 'active_record/connection_adapters/postgresql_adapter'

class ActiveRecord::ConnectionAdapters::PostgreSQLAdapter
  alias_method :configure_connection_without_interval, :configure_connection

  def configure_connection
    configure_connection_without_interval
    execute('SET intervalstyle = iso_8601', 'SCHEMA')
  end
end

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